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检索条件"任意字段=Conference on Advanced Signal Processing Algorithms"

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NEURAL NETWORK AND CLASSICAL LEAST SQUARES METHODS FOR QUANTITATIVE ANALYSIS IN REMOTE SENSING FTIR SYSTEMS

NEURAL NETWORK AND CLASSICAL LEAST SQUARES METHODS FOR QUANT...

引用

conference on Optical Instrumentation for Gas Emissions Monitoring and Atmospheric Measurements

作者： WANG, CD WALTER, WT KAGANN, RH AIL SYST INC DEER PKNY 11729

ISBN: (纸本)0819417122

Remote monitoring of molecular species in the atmosphere is accomplished using a Fourier transform infrared (FTIR) spectrometer. advanced processing algorithms utilized by AIL Systems include the classical least squares (CLS) technique as well as a more recently developed approach which combines digital finite impulse response filtering, adaptive sampling, and artificial neural networks (ANN) to improve detection sensitivity and estimation accuracy. This paper presents a comparison between the CLS and the ANN methods in estimating concentrations of multicomponent mixtures. Detection improvement of ANN over CLS has been demonstrated by examining SF₆ in a stack plume and toluene in a laboratory experiment.

关键词： Digital filtering signal processing Filtering (signal processing) FT-IR spectroscopy Neural networks Optical filters Bandpass filters Detection and tracking algorithms Algorithm development Finite impulse response filters

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RASSP signal processing architectures

RASSP signal processing architectures

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conference on advanced signal processing algorithms

作者： SHIRLEY, F BASSETT, B LETELLIER, JP LOCKHEED SANDERS INC NASHUANH 03061

ISBN: (纸本)0819419222

The rapid prototyping of application specific signal processors (RASSP) program is an ARPA/tri-service effort to dramatically improve the process by which complex digital systems, particularly embedded signal processors, are specified, designed, documented, manufactured, and supported. The domain of embedded signal processing was chosen because it is important to a variety of military and commercial applications as well as for the challenge it presents in terms of complexity and performance demands. The principal effort is being performed by two major contractors, Lockheed Sanders (Nashua, NH) and Martin Marietta (Camden, NJ). For both, improvements in methodology are to be exercised and refined through the performance of individual 'Demonstration' efforts. The Lockheed Sanders' Demonstration effort is to develop an infrared search and track (IRST) processor. In addition, both contractors' results are being measured by a series of externally administered (by Lincoln Labs) six-month Benchmark programs that measure process improvement as a function of time. The first two Benchmark programs are designing and implementing a synthetic aperture radar (SAR) processor. Our demonstration team is using commercially available VME modules from Mercury Computer to assemble a multiprocessor system scalable from one to hundreds of Intel i860 microprocessors. Custom modules for the sensor interface and display driver are also being developed. This system implements either proprietary or Navy owned algorithms to perform the compute-intensive IRST function in real time in an avionics environment. Our Benchmark team is designing custom modules using commercially available processor ship sets, communication submodules, and reconfigurable logic devices. One of the modules contains multiple vector processors optimized for fast Fourier transform processing. Another module is a fiberoptic interface that accepts high-rate input data from the sensors and provides video-rate output data to a

关键词： RAPID PROTOTYPING EMBEDDED signal PROCESSORS RASSP ARCHITECTURE SELECTION SIMULATION VHDL VIRTUAL PROTOTYPE INSTRUCTION SET ARCHITECTURE PRODUCT METRICS

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IMPAIRMENT OF PICTURE QUALITY BY signal FORMAT TRANSITIONS AND CASCADING OF BIT RATE REDUCTION algorithms IN CONTRIBUTION, POST-processing AND DISTRIBUTION OF TELEVISION PICTURE signalS

IMPAIRMENT OF PICTURE QUALITY BY SIGNAL FORMAT TRANSITIONS A...

引用

conference on advanced Image and Video Communications and Storage Technologies

作者： SCHERTZ, A INST RUNDFUNKTECH TV SYST & PSYCHOOPT SECTD-80939 MUNICHGERMANY

ISBN: (纸本)0819418021

In the foreseeable future the application of digital techniques in production, transmission, storage and processing as well as in distribution of television signals will involve the coexistence of various signal formats including analog ones and the increasing use of bit rate reduction procedures. The possible impairment of the picture quality by the application of various and possibly cascaded data rate reduction procedures in the framework of this development has not yet been clarified sufficiently. In order to support the public broadcasters of Germany, Austria, and Switzerland in introducing and utilizing digital techniques, the IRT carried out studies on this question in close cooperation with the broadcasters. For this purpose, a scenario of all relevant television chains from production to transmission was drawn up, a source tape including a selection of suitable test sequences was produced and these sequences were fed in all the selected chains. The results were recorded and subjective tests were carried out to evaluate the impairment of the picture quality. This paper includes the results of a quality assessment by experts at an intermediate stage of the project. The results of subjective tests are presented.

关键词： Televisions signal processing Analog electronics Digital signal processing Digital recording Data storage Digital video recorders Satellites Video Nonlinear optics

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Penalty function method for sidelobe control in least squares adaptive beamforming

Penalty function method for sidelobe control in least square...

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conference on advanced signal processing algorithms

作者： HUGHES, DT MCWHIRTER, JG DEF RES AGCY MALVERN GREAT MALVERN WR14 3PSWORCSENGLAND

ISBN: (纸本)0819419222

The weights required to maximize the SNR for array processing are well known and used extensively. However, in realistic situations it is often desirable to consider other factors. A common problem is the reduction of sidelobe jitter and sidelobe suppression while simultaneously maximizing SNR. In this paper we discuss a penalty function approach which can be used to satisfy all of these requirements by constraining a beampattern to lie arbitrarily close to a desired or quiescent beampattern and also satisfy a conventional look direction gain constraint. By a simple transformation it is possible to show how, in certain situations of physical interest, the method is equivalent to constraining the weight vector itself. We show how this method can be used for linear array and how the performance is affected by varying a user defined parameter. We conclude by showing how the method can envisaged as being equivalent to both a subspace projection technique and to diagonal loading with an extra quiescent constraint.

关键词： ADAPTIVE processing WEIGHT JITTER

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Generalized interpolators for advanced movement-compensated 50Hz-60Hz conversion of interlaced sequences

Generalized interpolators for advanced movement-compensated ...

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IEEE International conference on Image processing

作者： Vandendorpe, L Delogne, P Boucquey, D UNIV CATHOLIQUE LOUVAIN TELECOMMUN & REMOTE SENSING LAB B-1348 LOUVAIN BELGIUM UNIV CATHOLIQUE LOUVAIN TELECOMMUN & REMOTE SENSING LAB B-1348 LOUVAIN BELGIUM

ISBN: (纸本)0818673109;0780331222

Several television standards exist for TV and for HDTV signals. The world-wide interchange of programs makes the conversion between them of critical importance. Conventional transcoders use a static interpolation filter which is not able to deal with not correctly bandlimited television signals (for a discussion see [1]). More recently, motion compensation has been introduced in order to adapt interpolation to the signal. This approach proposes movement-oriented filtering and has been shown to give significant improvement [1,2]. However, the known algorithms do not offer a perfect reconstruction step when desired pixels have to be interpolated. Here, a new system is proposed for the conversion between popular interlaced TV standards (625 lines, 50 fields/s or 525 lines, 60 fields/s). The key feature is the use of generalized interpolators that are based on non-uniform sampling theory. The performance is compared with alternative interpolation techniques. In addition, the attached motion estimation algorithm relies on a segmentation in the target field (i.e. the unknown 60 Hz field) to avoid assignment problems.

关键词： signal filtering and prediction

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Real-time signal preprocessor trade-off study

Real-time signal preprocessor trade-off study

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Proceedings of the IEEE 1995 National Aerospace and Electronics conference. Part 2 (of 2)

作者： Hill, Kerry L. Foti, Laura C. Zebe, David B. Box, Brian A. WL/AAAT-2

Lockheed Sanders Configurable-Hardware Algorithm-Mappable Preprocessor (CHAMP) and the TMS320C80 Digital signal Processor advanced processing architectures have been evaluated for an infrared (IR) application by conducting a preprocessor trade-off study. The objective of the study was to determine which of the two is appropriate for the Medium Wave IR Array (MIRA) system. This study is based on the implementation of two IR algorithms each separately executed and evaluated on both of the architectures.

关键词： Computer hardware

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COMBINED GRAY-LEVEL AND MOTION SEGMENTATION FOR VERY LOW BIT-RATE CODING

COMBINED GRAY-LEVEL AND MOTION SEGMENTATION FOR VERY LOW BIT...

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conference on advanced Image and Video Communications and Storage Technologies

作者： GU, C SWISS FED INST TECHNOL SIGNAL PROC LABCH-1015 LAUSANNESWITZERLAND

ISBN: (纸本)0819418021

A region-based multi-criterion segmentation algorithm for image sequence coding is described in this paper. It is based on morphological segmentation, motion estimation, and compensation techniques. The concept of multi-criterion is introduced in the traditional gray-level segmentation process, which takes into account the high temporal redundancy. The current image is segmented into two different kinds of regions: homogeneous gray-level regions coded by texture modeling method or homogeneous motion regions represented by motion compensation. No prediction error needs to be transmitted. Contours are simplified by a new non-linear filter. Preliminary experimental results have demonstrated high potential performance, with the combination of the power of contour-texture approach and that of the motion compensation technique, for very low bitrate image sequence coding.

关键词： Image segmentation Image compression Motion estimation Image processing algorithms and systems Motion models Nonlinear filtering Image filtering Video 3D image processing Algorithm development

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MAT2DSP-A tool for evaluating implementation complexity of signal processing algorithms

MAT2DSP-A tool for evaluating implementation complexity of s...

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International conference on Acoustics, Speech, and signal processing (ICASSP)

作者： B. Friedlander Department Electrical & Computer Engineering University of California Davis CA USA

MAT2DSP is a MATLAB toolbox, currently under development, whose function is to estimate the implementation requirements of algorithms specified in the form of a MATLAB program. This toolbox is aimed at providing researchers developing advanced signal and image processing algorithms, a quick and convenient way of estimating what would be needed to implement their algorithm on a specified processor; MAT2DSP analyzes the user program and generates reports on its computational requirements.

关键词： signal processing algorithms MATLAB Costs Algorithm design and analysis signal processing Image processing Process design Mathematical analysis Software packages Software algorithms

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Optimization of a spaceborne sensor for the determination of cloud speed and height with a numerical simulation system

Optimization of a spaceborne sensor for the determination of...

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conference on advanced and Next-Generation Satellites

作者： Reulke, N Reulke, R Jahn, H GERMAN AEROSP RES ESTAB INST SPACE SENSOR TECHNOLD-12484 BERLINGERMANY

ISBN: (纸本)0819419478

A simulation system allows analyses of specific sensor configurations. Application areas for such an approach are: (1) design and optimization of optical sensors for specific (well known) applications, (2) sensitivity of different data products to position and calibration errors, (3) test of retrieval algorithms, and (4) mission support. The simulation system consists of mathematical and physical models to simulate the passage of electromagnetic radiation from the source of the emission to the sensor. The key part of this simulation system is a ray tracer interacting with a digital terrain model around an ellipsoid, it also includes sensor opto- electronics and spacecraft orbit calculation. Other parts are the simulation of the planetary atmosphere and the hardware of the sensor with additional retrieving algorithms. The usefulness of the simulation system for the optimization has been shown with a three-line CD sensor for the determination of cloud position and speed. For the simulation system clouds are assumed as a partly transparent, uniformly moving body, modeled by a digital terrain model over the surface. Furthermore a simple radiometric model was implemented: A cloud has a constant transmission, the ground surface and the clouds have constant albedos. The simulation shows that some conditions are mandatory for the determination of cloud speed and height, especially the movement of the sensor has to be an accelerated one. This will be reached though a highly elliptical orbit of the satellite. However, the determination will not be possible near pericentre.

关键词： Clouds Sensors Cameras Atmospheric modeling Planets signal processing CCD cameras Computer simulations Mathematical modeling Numerical simulations

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Development of an automated bond verification system for advanced electronic packages 8th

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8th International conference on Image Analysis and processing, ICIAP 1995

作者： Darboux, Michel Dinten, Jean-Marc DSYS/SCSI CENG 17 rue des Martyrs Grenoble Cedex 9F38054 France

ISBN: (纸本)3540602984

As the performance of an electronic product improves, the surface density of the board population increases drastically. As a consequence, the technology is moving from conventional components to surface mounted components. The solder joints are more and more difficult to inspect, they are no longer reachable by the standard inspection techniques (visible light or laser). However, X-rays still allow to access information concerning these joints. In this paper, we propose a diagnosis method for characterising solder joints of surface mounted components. This method is based on a comparison between three radiographic images acquired from a mounted component, the corresponding unsoldered component used as a model, and the unpopulated board. Firstly, the radiographies are preprocessed in order to get quantitative information. Then, an angle and X,Y position alignment is performed before the subtraction of the unpopulated board and the model component images from the mounted component image. This leads to the solder joint map, from which quantitative parameters are then extracted. After a description of the image processing algorithms, we present experimental results obtained on a typical component. These results show clearly the possibility to access important parameters characterising the solder joint. © Springer-Verlag Berlin Heidelberg 1995.

关键词： Image processing

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